March 2019 1 477 Report
Suatu radioisotop X mempunyai waktu paruh 30 hari, setelah disimpan selama 90 hari, maka berat radioisotop yang tersisa adalah...
A. 3,125%
B. 6,25%
C. 12,5%
D. 15,125%
E. 21,25%

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